[exceptions] Add base exceptions package (#6)

* [exceptions] Remove unused import

* [exceptions] Add base exceptions package & move InvalidRPCReplyError to base exceptions package

pyhmy/account.py

@@ -4,11 +4,14 @@ from .rpc.request import (
 
 from .rpc.exceptions import (
     RPCError,
-    InvalidRPCReplyError,
     RequestsError,
     RequestsTimeoutError
 )
 
+from .exceptions import (
+    InvalidRPCReplyError
+)
+
 from .blockchain import (
     get_sharding_structure
 )

pyhmy/blockchain.py

@@ -2,8 +2,8 @@ from .rpc.request import (
     rpc_request
 )
 
-from .rpc.exceptions import (
-    InvalidRPCReplyError,
+from .exceptions import (
+    InvalidRPCReplyError
 )
 
 _default_endpoint = 'http://localhost:9500'

pyhmy/exceptions.py

@@ -0,0 +1,14 @@
+from .rpc.exceptions import (
+    RPCError,
+    RequestsError,
+    RequestsTimeoutError
+)
+
+class InvalidRPCReplyError(RuntimeError):
+    """
+    Exception raised when RPC call returns unexpected result
+    Generally indicates Harmony API has been updated & pyhmy library needs to be updated as well
+    """
+
+    def __init__(self, method, endpoint):
+        super().__init__(f'Unexpected reply for {method} from {endpoint}')

pyhmy/rpc/exceptions.py

@@ -1,4 +1,3 @@
-import json
 import requests
 
 
@@ -10,15 +9,6 @@ class RPCError(RuntimeError):
     def __init__(self, method, endpoint, error):
         super().__init__(f'Error in reply from {endpoint}: {method} returned {error}')
 
-class InvalidRPCReplyError(RuntimeError):
-    """
-    Exception raised when RPC call returns unexpected result
-    Generally indicates Harmony API has been updated & pyhmy library needs to be updated as well
-    """
-
-    def __init__(self, method, endpoint):
-        super().__init__(f'Unexpected reply for {method} from {endpoint}')
-
 class RequestsError(requests.exceptions.RequestException):
     """
     Wrapper for requests lib exceptions